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目的：对比观察两种电位，为临床低频听力检测提供适宜指标。方法：将球形电极置于豚鼠圆窗膜上，引导出两种听觉诱发电位，即耳蜗电图慢成分（ Ｓ Ｗ Ｃ－ Ｅｃｏｃｈ Ｇ）和听觉早潜伏期 ４０ Ｈｚ相关电位（４０ Ｈｚ Ａ Ｅ Ｒ Ｐ－ Ｅ Ｌ Ｒ）。结果：两种电位的共同特点是频率响应好，波形稳定，易辨认，反应阈值低；４０ Ｈｚ Ａ Ｅ Ｒ Ｐ－ Ｅ Ｌ Ｒ 的振幅与声强始终成正比。阈值时略高于 Ｓ Ｗ Ｃ－ Ｅｃｏｃｈ Ｇ，但差异不显著（ Ｐ＞ ００５）。结论：这两种电位为临床及科研的低频听力检测提供良好的客观指标。
OBJECTIVE: To compare the two potentials and provide appropriate indexes for clinical low frequency hearing tests. METHODS: A spherical electrode was placed on a guinea pig round window membrane and led to two auditory evoked potentials, S W C-Ecoch G and 40 Hz AEP - E L R). Results: Common characteristics of the two potentials are good frequency response, stable waveform, easy recognition and low response threshold. The amplitude of 40 Hz A E R P E L R is always proportional to the sound intensity. The threshold value was slightly higher than that of S W C-Ecoch G, but the difference was not significant (P> 005). Conclusion: These two potentials provide good objective indicators for clinical and scientific research of low-frequency hearing tests.